You do know that West Coast and Fremantle have a lot of players from states other than Western Australia don't you, and there are plenty of Western Australians in the other 16 clubs as well?
You literally just proved why it's such a lame concept.
So West Coast players from other states are tight with their club team mates. Then you want them to go play with a bunch of other players they have no history or club culture with all the while potentially injuring one of their own teammates in the opposition side in a nothing game.
Brilliant concept.